Collaborative scene sharing for overcoming visual obstructions

ABSTRACT

Collaborative scene sharing for overcoming visual obstructions is provided. Video feeds of a scene are obtained from multiple devices viewing the scene from different angle. An obstruction obstructs portion(s) of the scene from view by a device. An aggregation grid that partitions views of the scene into cells is established and used in providing an aggregated view of the scene to the device. This includes identifying cell(s) of the aggregation grid for which the view by the device is obstructed by the obstruction, and providing to the device video portion(s) obtained from video feed(s) from the multiple devices. The video portion(s) correspond to the cell(s) for which the view by the device is obstructed, and the video feeds from which the video portions are obtained are from other device(s), of the multiple devices, for which the view for the cell(s) is unobstructed.

BACKGROUND

When viewing a scene from a distance, expected or unexpectedobstructions may present themselves between the viewer and portions ofthe scene. A common example is a teacher present in front of ablackboard in a classroom or lecture hall obstructing some students fromviewing the entire blackboard and its contents. An obvious consequenceis that some viewers are at least temporarily unable to see beyond theobstruction and may miss important occurrences or content presented inthe scene, such as information on the blackboard or visual elements of aslideshow.

SUMMARY

Shortcomings of the prior art are overcome and additional advantages areprovided through the provision of a computer-implemented method thatincludes obtaining an aggregation grid by a wearable device of multiplewearable devices capturing respective video feeds of a scene of anenvironment from different angles. The aggregation grid provides aconsistent partitioning of views of the scene by the multiple wearabledevices into cells. The method also includes, based on an obstruction atleast partially obstructing a portion of the scene from view by thewearable device, building an aggregated view of the scene for thewearable device. The building includes identifying one or more cells ofthe aggregation grid for which the view of the scene by the wearabledevice is obstructed by the obstruction. The building also includesobtaining, by the wearable device, from at least one other wearabledevice of the multiple wearable devices, one or more video portions ofat least one video feed of the respective video feeds. The one or morevideo portions correspond to the one or more cells for which the view bythe wearable device is obstructed, and the at least one video feed isfrom the at least one other wearable device, for which the view for theone or more cells is unobstructed. The building further includesdisplaying the obtained one or more video portions on a display of thewearable device, in which the one or more video portions are provided onthe display for the one or more cells for which the view by the wearabledevice is being obstructed.

Further, a wearable device is provided that includes a memory and aprocessor in communication with the memory. The wearable device isconfigured to perform a method, the method including obtaining anaggregation grid. The wearable device is one wearable device of multiplewearable devices capturing respective video feeds of a scene of anenvironment from different angles. The aggregation grid provides aconsistent partitioning of views of the scene by the multiple wearabledevices into cells. The method also includes, based on an obstruction atleast partially obstructing a portion of the scene from view by thewearable device, building an aggregated view of the scene for thewearable device. The building includes identifying one or more cells ofthe aggregation grid for which the view of the scene by the wearabledevice is obstructed by the obstruction. The building also includesobtaining from at least one other wearable device of the plurality ofwearable devices, one or more video portions of at least one video feedof the respective video feeds, the one or more video portionscorresponding to the one or more cells for which the view by thewearable device is obstructed, and the at least one video feed beingfrom the at least one other wearable device, for which the view for theone or more cells is unobstructed. The building further includesdisplaying the obtained one or more video portions on a display of thewearable device, in which the one or more video portions are provided onthe display for the one or more cells for which the view by the wearabledevice is being obstructed.

Yet further, a computer program product is provided. The computerprogram product includes a computer readable storage medium readable bya processing circuit and storing instructions for execution by theprocessing circuit is provided for performing a method. The methodincludes obtaining an aggregation grid by a wearable device of multiplewearable devices capturing respective video feeds of a scene of anenvironment from different angles. The aggregation grid provides aconsistent partitioning of views of the scene by the plurality ofwearable devices into cells. The method further includes, based on anobstruction at least partially obstructing a portion of the scene fromview by the wearable device, building an aggregated view of the scenefor the wearable device. The building includes identifying one or morecells of the aggregation grid for which the view of the scene by thewearable device is obstructed by the obstruction. The building alsoincludes obtaining, by the wearable device, from at least one otherwearable device of the multiple wearable devices, one or more videoportions of at least one video feed of the respective video feeds. Theone or more video portions correspond to the one or more cells for whichthe view by the wearable device is obstructed, and the at least onevideo feed is from the at least one other wearable device, for which theview for the one or more cells is unobstructed. The building furtherincludes displaying the obtained one or more video portions on a displayof the wearable device, in which the one or more video portions areprovided on the display for the one or more cells for which the view bythe wearable device is being obstructed.

Additional features and advantages are realized through the conceptsdescribed herein.

BRIEF DESCRIPTION OF THE DRAWINGS

Aspects described herein are particularly pointed out and distinctlyclaimed as examples in the claims at the conclusion of thespecification. The foregoing and other objects, features, and advantagesof the invention are apparent from the following detailed descriptiontaken in conjunction with the accompanying drawings in which:

FIG. 1 illustrates an environment in which individuals with differentvantage points have different viewable portions of a scene as a resultof an obstruction;

FIG. 2A-2C depicts an aggregation grid partitioning a scene andidentifying obstructed and unobstructed grid cells from differentvantage points of the scene, in accordance with aspects describedherein;

FIG. 3 depicts the building an aggregated view of a scene based onstitching together video portions from live video feeds, in accordancewith aspects described herein;

FIG. 4 depicts an example process for collaborative scene sharing forovercoming visual obstructions, in accordance with aspects describedherein;

FIG. 5 depicts an example of a computer system to incorporate or useaspects described herein;

FIG. 6 depicts an example of a wearable device to incorporate or useaspects described herein; and

FIG. 7 depicts one embodiment of a computer program product.

DETAILED DESCRIPTION

When expected or unexpected obstructions obstruct a viewer's partial orentire view of a scene, the viewer misses potentially valuableinformation. Consider a scenario in which students in a classroom takenotes from a blackboard/digital board/chalkboard during a lesson wherean obstruction (such as a teacher) stands near the board at leastpartially blocking the full view of the board. The portions of the scene(e.g. the blackboard) being obstructed by the teacher will vary amongthe different students depending on their vantage point, or angle ofview to the board. FIG. 1 illustrates this in an environment in whichindividuals with different vantage points have different viewableportions of a scene as a result of an obstruction. In the overhead viewof FIG. 1 showing environment 100, an obstruction 106 is positionedbetween a board 104 and a group of individuals 102 positioned indifferent locations of the environment. The pairs of dashed lines inFIG. 1 originating from the individuals 102 a, 102 b, 102 c illustraterespective views of individuals 102 a, 102 b and 102 c corresponding toportions of the scene being blocked from view by obstruction 106.Individual 102 a, for example, is able to view the left side of board104 but is blocked from viewing a significant portion of the right sideof board 104. Individual 102 c can view the right side of board 104 butvery little of the left side, and individual 102 b can view both sidesbut cannot view a center portion of board 104. Obstruction 106 could beany obstruction, such as another individual (like a teacher in front ofthe room), a piece of equipment such as a projector, or a structuralfeature of the environment such as a pillar or column, as examples.

Aspects described herein provide collaborative scene sharing in whichimages/video of a scene from multiple vantage points, some of which mayinclude partial obstructions from view of the full scene, are stitchedtogether to provide an aggregated view of the scene to the viewers.Using the above scenario, aspects described herein provide a solutionwhere the students would be able to see a complete and personalized (totheir vantage point) view of the scene of the board. Because, as notedabove, the areas being obstructed from view will vary across thedifferent viewers, a personalized display can be provided to each viewerbased on what portions the viewer is lacking in terms of what the viewercan see from the viewer's position.

Some embodiments provide a wearable device-based solution. In anexample, viewers are each presented a complete scene visible in adisplay of their respective wearable device. The area(s) of the scenethat are obstructed from view in the viewer's natural line of sight areprovided in the display to overlay what the user would see lookingthough the display. In this regard, wearable devices can havelens-displays that are transparent like the clear lenses of commonglasses but that incorporate display technology. This can allow forimages and other content to be presented on the inside surface of thelens—the side facing the user's eye—and integrate with the natural lineof sight of the user. Images of the portions of the scene behind theobstruction as viewed by the viewer are acquired from other devices inthe environment and presented on the wearable device display to overlaythe obstructed portions of the viewer's view. The aggregated viewprovides to the viewer the look and feel of a full view to the scene,with the viewer continuing to look straight ahead through the lenses ofthe wearable device. Additionally or alternatively, the wearable devicemay have a display positioned in the peripheral view of the user, inwhich case an aggregated view of the scene can be presented on thatdisplay. For wearable devices with both forms of display, powerconsumption may factor into the selection of how to present theaggregated scene to the user. Because non-visible area(s) of a scenevary from one viewer to another, aspects described herein advantageouslyprovide a personalized view of the scene for each viewer by, in part,determining which portions are being obstructed from a viewer's view andfilling-in those portions with content acquired from other viewer(s) whohave a view of the portions.

Wearable devices, and in particular head-mounted wearable devices, areinherently designed with ergonomic and other considerations taken intoaccount. This enables content to be displayed to a user in a usefulmanner in which the content is integrated into the user's natural viewof the surrounding environment. Further details of an example wearabledevice to incorporate and/or use aspects described herein are describedinfra with reference to FIG. 6.

With respect to a wearable device embodiment in which a collection ofdevices acquire images/video of a scene from different angles, softwarerunning on a respective wearable device of each viewer/student (or otherdevice with imaging capability) may continuously or periodicallyleverage a camera or other imaging system of the device to acquireimages of the scene. In a specific example, the viewers wear a wearabledevice, such as the example wearable device as shown in FIG. 6, that hasa camera that images the scene. The viewers' wearable (in this example)devices capture dynamic views of a board on which a teacher writes. Theviews of the board are internally represented as a grid of cells in thewearable devices and an aggregation server, if present. The aggregationgrid partitions the scene into portions in order to facilitate lateraggregation of these grid portions. This aggregation grid is determinedbased on dimensions of the board, proximity to the scene features,and/or any other desired consideration. A grid formation algorithm canbe consistent across the wearable devices so that images of a cell ofthe scene from one student's device can be conveniently substituted intothe corresponding cell for another student's device.

Example view representation of students viewing the board from the firstrow are shown in FIG. 2A-2C. More specifically, FIGS. 2A-2C depict anaggregation grid partitioning a scene and identifying obstructed andunobstructed grid cells from different vantage points of the scene, inaccordance with aspects described herein.

FIG. 2A shows a vantage point of a first student viewing the boardroughly from the center behind teacher 206. Aggregation grid 208overlays the scene of the board, and teacher 206 is shown obstructingthe first student's view to various cells. In this example, all cells ofcolumns 208 b and 208 c (except the two cells in the first row of thegrid) and a single cell in column 208 d is being obstructed by teacher206. The obstructed grid cells for the first student are shown instipple pattern in FIG. 2A, while the un-stippled cells reflect portionsfor which the first student's view is unobstructed. As a result of theobstruction, the first student has a view to only some of content 210 ofthe board.

FIG. 2B reflects the obstructed/unobstructed cells for a second studentwith a vantage point from a right-side (looking at the board) of thespace. Again the obstructed grid cells are shown in stipple pattern. Dueto the angle from which the second student views the board, the teacherobstructs all cells of column 208 a except the cell in the first row ofthe grid. Thus, in this example, the second student happens to have aview to every cell that the first student cannot see, and vice versa.

In some examples, images from a vantage point of the obstruction itselfmay be obtained and used in the aggregation. As a specific example, theteacher in the examples of FIGS. 2A-2C can also wear a wearable devicewith a camera. FIG. 2C reflects an example set of cells viewable by acamera of the teacher's wearable device. Because of the proximity of theteacher to the board and the position of the teacher in this example,the majority of cells are not viewable (the stipple pattern grid cellsin FIG. 2C are those for which the teacher does not have a direct viewwithout moving or facing another direction). However, a relativelyhigh-quality, albeit very close, view of the content 210 from cells incolumns 208 b and 208 c is provided from the teacher's current vantagepoint.

It is seen that every grid cell of the scene of FIGS. 2A-2C is visibleto at least one person in the class (based on the position from wherestudent/teacher is viewing the board). The wearable devices of allparticipating users collect and provide images/videos of the grid cellsthat are visible to them. These image/video portions can be dynamicallyshared across the wearable devices to reduce or eliminate the number ofobstructed areas of the aggregation grid.

During runtime, and as the scene dynamically changes (for instance theobstruction moves around), each wearable device collects image/videoportions and provides one or more to the appropriate entity/entities foraggregation. The appropriate entity may be only itself (if no otherwearable device needs an image portion from the wearable device), or maybe one or more remote entities, such as server(s) preformingaggregation, or other wearable devices. In this regard, thecollection/aggregation from the wearable devices of the image/videoportions of unobstructed cells could be performed by one or morecentralized servers or in a distributed fashion among the wearabledevices. Each wearable device can also maintain an indication of thecells for which its view is blocked. That indication changes dynamicallyas the obstruction and/or the student moves around. The indication canbe provided by the wearable device to a remote aggregation entity, inthe case that the distribution of image/video portions is controlled bya central server, or provided to one or more peer wearable devices, inthe case that each wearable device is responsible for its own fetchingand integration of missing image portions.

The sizing of the grid cells can be adjusted depending on a variety ofconsiderations, including processing capability of the device or devicesperforming aggregation, and/or the capabilities of the imaging devices,as examples. One approach is to start with a ‘medium’-sized grid anddynamically adjust the cell sizing based on the accuracy obtained (e.g.using normal regression). Imperfections in the stitching of imageportions from different devices may be less noticeable with a moregranular, smaller cell size, though a resulting greater number of cellsdemands more processing resources and power.

FIG. 3 depicts the building of an aggregated view of a scene based onstitching together video portions from live video feeds, in accordancewith aspects described herein. As described previously, there aredifferent possibilities for which device or devices build an aggregatedview for a wearable device. The wearable devices capture video fromtheir respective vantage points. In some examples, various wearabledevices provide video portions to remote server(s) that then build anaggregated view for a wearable device and provide the aggregated view tothe wearable device. Provision of the aggregated view could be provisionof a complete video for display, or could be provision of only the videoportions needed for the wearable device to complete the scene (fill inthe obstructed cells with obtained video portions).

The video portions provided to the remote server(s) by a wearable devicecan be grid cell portions for which the scene is unobstructed from viewby the wearable device. A wearable device can isolate the video portionsfrom the captured video and then provide the isolated portions to theremote server(s), or, to reduce processing on the wearable device, thewearable device provides the captured video with both obstructed andunobstructed portions, and the remote server(s) perform the isolation.Together with a given captured video or video portions, the wearabledevice or the remote server(s) can determine which cells of the grid areobstructed versus which cells are not obstructed.

Additionally or alternatively, the building of the aggregated viewscould be handled in a distributed manner, in which a wearable deviceidentifies the video portions that it needs (those for which its view isobstructed) and the video portions for which its view is unobstructed,communicates this to one or more other wearable devices, receives theneeded video portions from the other wearable device(s) withunobstructed views to the identified needed portions, and assembles thereceived portions into its aggregated view.

This building of an aggregated view is depicted in FIG. 3, where theviews 312 a, 312 b and 312 c depicted in FIGS. 2A-2C, respectively, areaggregated into an aggregated view 314. A video selection algorithm canbe used when there are multiple available, unobstructed video portionscorresponding to a same grid cell. The quality, view angle, or othercharacteristics of the video portions can be used to assess the best oneto use for the aggregation. It is also noted that the aggregated viewmay be built for a common perspective or viewpoint—in the example ofFIG. 3, it is head-on to the board. This is useful in situations where acomplete aggregated view is being pushed to a user and displayed fullyon a display, as opposed to the scenario where only the obstructedportions are being displayed as an overlay to the user's line of sight.Video portions obtained from the various wearable device may be obtainedfrom different angles, so the video portions may be processed to reduceor eliminate skew and normalize them to a common vantage point for thecomplete view.

Additionally or alternatively, in the scenario where only the obstructedportions are being displayed as an overlay to the user's line of sight,a skew or similar distortion can be applied to an obtained video portionbefore sending it to a wearable device for aggregating the view, inorder to align with the viewpoint of that wearable device and provide amore realistic integration of the video portion with the user'sunobstructed cells.

The following sets forth further example implementation details that maybe followed in some embodiments:

-   -   When a student enters the class and views a scene (such as a        blackboard), software in the wearable device queries a        centralized server to provide an established grid (i.e. grid        configuration—number of rows, number of columns, cell size,        etc.) for the scene.    -   Software in the wearable device internally creates the grid        representation for the scene. Software will identify (i) grid        cells for which the view to the scene is at least partially        obstructed, and (ii) other grid cells for which the view to the        scene is unobstructed.    -   An generalized algorithm as follows is performed:        -   (i) Software in each wearable device corresponding to a            student pushes its respective captured video portions            corresponding to its respective unobstructed cells to a            centralized server and provides an index of the respective            obstructed cells;        -   (ii) The server collects the video portions from each of the            wearable devices and dynamically constructs a complete view            of the scene;        -   (iii) The server also pushes to each wearable device the            appropriate video portions corresponding to the obstructed            cells for that device (i.e. pushes video portions of            unobstructed views for those cells to the wearable device to            substitute for the obstructed views). The device then has            video portions that it can use to fill in over its            obstructed cells.        -   (iv) Steps (i)-(iii) above are iterated, to thereby maintain            an aggregated view of the scene and provide a complete,            personalized view to each student corresponding to the            wearable devices.    -   The generalized algorithm above may be relatively expensive        approach; various optimizations and intelligent heuristics could        be incorporated to reduce the number of push/pulls between the        server and the wearable devices.

Alternatively as described herein, the above could be implemented in adistributed fashion without any centralized server.

Further details are provided regarding grid cell direction and qualityalignment. Because grid cells are being received from students atvarious positions, the orientation of the board characteristics of thevideo portions obtained from the different wearable devices will vary atgrid cell granularity. The image/video portions can therefore benormalized to harmonize portions obtained from different captureddevices. Alignment of all grid cells can be adjusted with respect to acommon reference grid cell, to maintain a common orientation across allgrid cells. Skew, zoom, and other transformations can be applied to theimages/videos obtained from different devices. Picture quality similarlymay be different for different captured devices—one may have greaterbrightness than another, for instance. A direct replacement of a cellwith a video portion from another wearable device may show somedeviation in the displayed content in these scenarios. The system cantherefore adjust the image/video portions accordingly.

In some embodiments, video portions are adjusted differently accordingto the recipient of the video portion. A video portion, obtained from astudent at the right side of the room, that is to be provided to astudent at the left side of the room can be skewed to the angle of thereceiving student's viewpoint. This can be done by a central server orby the receiving (or providing) wearable device. More generally,profile-based auto-correction can be applied to received video portions.The profile refers to a profile personalized for a recipient-device. Agiven wearable device may have substantially better hardware resourcesthan another wearable device. Software in the server(s) or wearabledevices themselves can auto-correct content based on the device'sprofile.

In some embodiments, the wearable devices are responsible for detectingview obstacles/obstructions, and in this regard various approaches areavailable. As an example, camera(s) can be used to measure distanceswithin a field of view. A gaze point tracker(s) can identify a user'sfocus-area and the camera can determine a distance to the area. If anobject is detected between the eye position of the user and thefocus-area, then it can be considered an obstruction and the distance tothe obstruction is determined. When an obstacle is detected, softwareinstalled in the wearable device or a server checks whether videoportions depicting an unobstructed view to that portion of the scene areavailable. Ideally, there will be one or more wearable devices inrelatively close proximity that do have an unobstructed view to thatportion of the scene.

A field of view of any user includes the focus areas as well asperipheral areas. In a large environment with multiple participatingviewers, such as a sports stadium or concert venue, there will bedifferent focus areas among the different viewers. They will be lookingat/viewing potentially different objects and their three-dimensionalfields of view will overlap with each other. Aspects described hereinidentify portions of a viewer's field of view where an obstruction isdetected, and then replace or overlay those portions with contentcaptured from others' fields of view. This is irrespective of what eachuser is focusing on in terms of his/her eyesight; a camera will capturethe field of view including the object of focus for that viewer and theperipheral surroundings regardless of where the user's eyesight isfocused.

Aspects described herein can also provide zoomed or more detailedcontent to individual users. Any portion(s) of the scene can be ‘zoomed’in the wearable display, if desired, for example the user can zoom inand/or out of any portion of the view, including portions obtained fromother devices.

In some embodiments, the zoom is based on the user's eye focusdirection. Consider an example where viewers A, B and C are looking at(visually focusing on) a target object X from different distances. Acommon example would be fans in a baseball stadium viewing a particularplayer or occurrence on the field. User C is nearest target object X,followed by user B, and then user A. Software of a server or thewearable device(s) can identify which users in the stadium are lookingat the target object X based on their eye directions. If user A desiresto view object X in more detail or at a closer distance, user A canobtain (based on a request, for instance) portion(s) of the video feedfrom a closer user, such as user C. Software installed on user A′sdevice (as an example) identifies which other user devices can provide aclearer, closer, etc. view to the target object. The software canmonitor for dynamic changes in both the target being viewed as well asthe users who can offer a view to the target, and changes can be madeaccordingly. If user C changes position and no longer offers a view tothe target object, the software can dynamically identify another user(e.g. user B) who can provide a better view for user C.

In accordance with further aspects, the system will track the seatingarrangement of viewers in the environment and offer recommendations asto the positioning of viewers in order to maximize the effectiveness ofthe system to capture necessary views of the scene portions. A wearabledevice of a student entering the environment can indicate to the studentwhere to sit in order to enhance the system's collaborative viewsharing, for instance to (i) minimize a total number of students neededto obtain an unobstructed view of every cell, (ii) provide clearer orhigher quality views of cells for which the existing view issub-optimal, and/or (iii) minimize the number of obstructed cells forwhich video portions need to be obtained by the student's device, asexamples.

When software in each wearable device pushes video portions forunobstructed cells the centralized server, it can also push the positionof the obstruction(s) and the position of the student. When a studententers the class, a navigation application can determine and suggest aseating position for the student. For instance, based on the indications(maintained by the server) of the cells for which no views or relativelypoor views are present and/or based on the position of the obstruction,the navigation application installed on the entering student's wearabledevice suggests the best position at which the student should sit.

The recommendation could be suggested by correlating the obstructedcells (quadrant and position to be filled in the student's grid) withthe position of the student and the teacher. This student positionrecommendation could also be achieved through a supervised learningmodel using a student classroom visual training data-set. Thecentralized server can collect and store details of existing studentpositions, position of the obstruction(s), image quality indications,etc., and reverse map these to the grid to find the optimal position forthe entering student.

The blackboard example described throughout is just one example ofcollaborative scene sharing for overcoming visual obstructions, inaccordance with aspects described herein. These aspects can begeneralized to any desired target screen, presentation, live event, orscene generally. In a relatively massive implementation, hundreds orthousands of viewers are watching a sporting event, concert, or the likein a large environment such as a stadium. There could be at any point intime multiple obstacles, such as nearby viewers who stand up, suspendedcameras or other equipment, a scoreboard, players on the field etc. Someor all of these obstacles might be dynamic in that their positioning andpresence it not necessarily predictable. Appropriate video portions fromthe appropriate participating wearable devices will be identified andprovided to other devices that can build aggregated, obstacle-free viewsof the scenes.

Approaches involving smart-boards and fixed cameras in a classroom withmerely live streaming capabilities do not alone address problems thatare addressed by aspects described herein. It is desired, and aspectsdescribed herein provide, for streaming appropriate video portions tovarious users based on their view of the obstacles, and this may be verydynamic, varying over time for a given person, and varying from oneperson to another. Users are able to view the target object(s)/scene aslive as possible while compensating for obstructed views using videofeeds from others, thus ensuring a live experience for the user.

Accordingly, processes for collaborative scene sharing for overcomingvisual obstructions are provided in accordance with aspects describedherein. FIG. 4 depicts an example such process, which may be performedby one or more computer systems, such as one or more backend remotecomputer systems, one or more wearable devices, or a combination of theforegoing. Initially, there are a plurality of wearable devices viewinga scene from different angles, where an obstruction at least partiallyobstructs a portion of the scene from view by a wearable device of theplurality of wearable devices. The process establishes an aggregationgrid partitioning views of the scene from the plurality of wearabledevices into a plurality of cells (402). The aggregation grid may beconsistent across the views from the plurality of wearable devices inthat a given cell of the grid covers the same part of the sceneregardless of the vantage point. The established aggregation grid isprovided to the wearable device (404), for instance to facilitate itsidentification of the partitioning of the views of the scene into theplurality of cells. Video feeds of the scene (which may be live videofeeds) are obtained from the plurality of wearable devices viewing thescene from the different angles (406). It is noted that this obtainingcould be before and/or after the aggregation grid is established. Insome examples, the live video feeds are obtained from the plurality ofwearable devices based on providing them with the aggregation grid,where an obtained live video feed from a wearable device includes videoportions corresponding to cells, of the aggregation grid, for which theview by the wearable device is unobstructed.

The process continues by providing an aggregated view of the scene tothe wearable device (408). Provision of the aggregated view includesidentifying one or more cells of the aggregation grid for which the viewby the wearable device is obstructed by the obstruction, and providingto the wearable device one or more video portions obtained from at leastone video feed of the plurality of video feeds, the one or more videoportions corresponding to the one or more cells for which the view bythe wearable device is obstructed, and the at least one video feed fromwhich the one or more video portions are obtained being from at leastone other wearable device, of the plurality of wearable devices, forwhich the view for the one or more cells is unobstructed. In someembodiments, the providing includes building the aggregated view of thescene by stitching together video portions from the plurality of livevideo feeds, the video portions corresponding to the cells of theaggregation grid and showing unobstructed views for the cells to providean unobstructed aggregated view of the scene.

Unless it is decided at (410) to end the provision of the aggregatedview of the scene to the wearable device, the process returns to (406)to continue obtaining video feeds of the scene and then provide theaggregated view, the thereby continually provide the aggregated view ofthe scene to the wearable device over a period of time. As part of this,updated video portions from the at least one live video feed arecontinually provided to the wearable device for presentation to a userin place of the obstructed view for the one or more cells. It is notedthat the cells that are being obstructed from view may change over timeas the obstruction or the viewer moves in the environment, and thereforethe continuous provision of the aggregated view may include dynamicallyadjusting which particular cells from which wearable devices are beingprovided to the wearable device to provide the aggregated view for thewearable device.

It is also noted that the process of FIG. 4 may be performed to providean aggregated view to each of multiple other devices. In this case, theaggregated view of the scene is provided to multiple other wearabledevices of the plurality of wearable devices, the providing comprising:identifying, for each wearable device of the multiple other wearabledevices, a respective one or more cells of the aggregation grid forwhich the view by the respective wearable device is being obstructed bythe obstruction, and providing to each wearable device of the multipleother wearable devices a respective one or more video portions obtainedfrom one or more video feeds of the plurality of video feeds, therespective one or more video portions corresponding to the respectiveone or more cells for which the view by the respective wearable deviceis being obstructed.

The obtaining the plurality of live video feeds, the establishing theaggregation grid, and the providing the aggregated view of the scene areperformed, in some embodiments, by the wearable device (to which theaggregated view is provided) itself, and the wearable device canaggregate the view of the scene on a transparent display of the wearabledevice, in which the one or more video portions are provided on thetransparent display for the one or more cells for which the view by thewearable device is being obstructed, and no video portions are providedon the transparent display for cells for which the view by the wearabledevice is unobstructed. Additionally or alternatively, the obtaining theplurality of live video feeds, the establishing the aggregation grid,and the providing the aggregated view of the scene can be performed by aserver separate from the plurality of wearable devices, where theproviding the one or more video portions includes the server sending theone or more video portions to the wearable device (to which theaggregated view is provided).

In some examples, an indication is received from the wearable device,the indication being an indication of the one or more cells of theaggregation grid for which the view by the wearable device is obstructedby the obstruction. The received indication of the one or more cells maybe used (i.e. by the computer system performing a process to provide theaggregated view) to identify the one or more cells and provide the oneor more video portions to the wearable device.

Additionally or alternatively, video portions of the obtained pluralityof live video feeds may be normalized prior to providing the one or morevideo portions to the wearable device.

The cell size and/or other characteristics of the aggregation grid maybe dynamically adjusted periodically or aperiodically, and theadjustment may be based on an assessed quality of the aggregated view ofthe scene.

As an enhancement, a live video feed of the plurality of live videofeeds may be obtained from a device viewing at least a portion of thescene from a vantage point of the obstruction. An example describedherein is the device being worn by a teacher who is writing on the boardand partially obstructing the view of the students to the board. Theportion of the scene can correspond to (i.e. cover or encompass) a cellof the one or more cells for which the view by the wearable device isobstructed. In this situation, at least one video portion provided tothe wearable device for the cell can include a video portion from thelive video feed from that device viewing from the vantage point of theobstruction.

Based on detecting presence of another wearable device forparticipation, for instance the entrance of another student into theenvironment, the process can determine at least one cell of theaggregation grid for which a new view is desired. Based on thatdetermination, the process can provide a suggestion of a position atwhich the another wearable device is to be situated such that provisionof a live video feed by that another wearable device from the positionprovides a live video feed with video portions providing the new view.‘New’ view in this sense may be one for which no view was previouslyprovided and therefore the requested position is selected to provide theview. Alternatively, the new view may be a better view, offer betterquality feed, and/or one providing a different vantage point than a view(of the cell) currently being provided by one of the wearable devicesalready participating.

Processes described herein may be performed singly or collectively byone or more computer systems, such as computer system(s) described belowwith reference to FIG. 5. In some examples, such a computer system thatperforms process(es) described herein is a wearable device on which anaggregated view is provided. Additionally or alternatively, a remotecomputer system in communication with such computer system performsprocess(es) described herein. As a third possibility, a combination ofthe (i) wearable device and (ii) remote computing system(s) performprocess(es) described herein.

FIG. 5 depicts one example of a computer system to incorporate and useaspects described herein. A computer system may also be referred toherein as a processing device/system or computing device/system, orsimply a computer. Computer system 500 may be based on one or more ofvarious system architectures such as those offered by InternationalBusiness Machines Corporation (Armonk, N.Y., USA) or Intel Corporation(Santa Clara, Calif., USA), as examples.

Computer system 500 is suitable for storing and/or executing programcode and includes at least one processor 502 coupled directly orindirectly to memory 504 through, e.g., a system bus 520. In operation,processor(s) 502 obtain from memory 504 one or more instructions forexecution by the processors. Memory 504 may include local memoryemployed during actual execution of the program code, bulk storage, andcache memories which provide temporary storage of at least some programcode in order to reduce the number of times code must be retrieved frombulk storage during program code execution. A non-limiting list ofexamples of memory 504 includes a hard disk, a random access memory(RAM), a read-only memory (ROM), an erasable programmable read-onlymemory (EPROM or Flash memory), an optical fiber, a portable compactdisc read-only memory (CD-ROM), an optical storage device, a magneticstorage device, or any suitable combination of the foregoing. Memory 504includes an operating system 505 and one or more computer programs 506,for instance programs to perform aspects described herein.

Input/Output (I/O) devices 512, 514 (including but not limited todisplays, microphones, speakers, accelerometers, gyroscopes,magnetometers, light sensors, proximity sensors, GPS devices, cameras,etc.) may be coupled to the system either directly or through I/Ocontrollers 510.

Network adapters 508 may also be coupled to the system to enable thecomputer system to become coupled to other computer systems, storagedevices, or the like through intervening private or public networks.Ethernet-based (such as Wi-Fi) interfaces and Bluetooth® adapters arejust examples of the currently available types of network adapters 508used in computer system.

Computer system 500 may be coupled to storage 516 (e.g., a non-volatilestorage area, such as magnetic disk drives, optical disk drives, a tapedrive, etc.), having one or more databases. Storage 516 may include aninternal storage device or an attached or network accessible storage.Computer programs in storage 516 may be loaded into memory 504 andexecuted by a processor 502 in a manner known in the art.

The computer system 500 may include fewer components than illustrated,additional components not illustrated herein, or some combination of thecomponents illustrated and additional components. Computer system 500may include any computing device known in the art, such as a mainframe,server, personal computer, workstation, laptop, handheld or mobilecomputer, tablet, wearable device, telephony device, network appliance,virtualization device, storage controller, etc.

FIG. 6 depicts another example of a computer system to incorporate anduse aspects described herein. FIG. 6 depicts an example eyewear basedwearable device. Device 600 can include many of the same types ofcomponents included in computer system 500 described above. In theexample of FIG. 6, device 600 is configured to be wearable on the headof the device user. The device includes a display 602 that is positionedin a peripheral vision line of sight of the user when the device is inoperative position on the user's head. Suitable displays can utilizeLCD, CRT, or OLED display technologies, as examples. Lenses 614 mayoptionally include active translucent displays, in which an inner and/orouter surface of the lenses are capable of displaying images and othercontent. This provides the ability to impose this content directly intothe line of sight of the user, overlaying at least part of the user'sview to the environment through the lenses. In particular embodimentsdescribed herein, content presented on the lens displays are videoportions that provide an unobstructed view of a scene by overlaying withthis video portions areas of the user's view that include an obstructedview to the scene.

Device 600 also includes touch input portion 604 that enable users toinput touch-gestures in order to control functions of the device. Suchgestures can be interpreted as commands, for instance a command to takea picture, or a command to launch a particular service. Device 600 alsoincludes button 606 in order to control function(s) of the device.Example functions include locking, shutting down, or placing the deviceinto a standby or sleep mode.

Various other input devices are provided, such as camera 608, which canbe used to capture images or video. The camera can also be used by thedevice to obtain an image of the user's view of his or her environmentto use in, for instance, capturing images/videos of a scene. One or moremicrophones, proximity sensors, light sensors, accelerometers, speakers,GPS devices, and/or other input devices (not labeled) may beadditionally provided, for instance within housing 610. Housing 610 canalso include other electronic components, such as electronic circuitry,including processor(s), memory, and/or communications devices, such ascellular, short-range wireless (e.g. Bluetooth), or WiFi circuitry forconnection to remote devices. Housing 610 can further include a powersource, such as a battery to power components of device 600.Additionally or alternatively, any such circuitry or battery can beincluded in enlarged end 612, which may be enlarged to accommodate suchcomponents. Enlarged end 612, or any other portion of device 600, canalso include physical port(s) (not pictured) used to connect device 600to a power source (to recharge a battery) and/or any other externaldevice, such as a computer. Such physical ports can be of anystandardized or proprietary type, such as Universal Serial Bus (USB).

Referring to FIG. 7, in one example, a computer program product 700includes, for instance, one or more computer readable storage media 702to store computer readable program code means, logic and/or instructions704 thereon to provide and facilitate one or more embodiments.

The present invention may be a system, a method, and/or a computerprogram product. The computer program product may include a computerreadable storage medium (or media) having computer readable programinstructions thereon for causing a processor to carry out aspects of thepresent invention.

The computer readable storage medium can be a tangible device that canretain and store instructions for use by an instruction executiondevice. The computer readable storage medium may be, for example, but isnot limited to, an electronic storage device, a magnetic storage device,an optical storage device, an electromagnetic storage device, asemiconductor storage device, or any suitable combination of theforegoing. A non-exhaustive list of more specific examples of thecomputer readable storage medium includes the following: a portablecomputer diskette, a hard disk, a random access memory (RAM), aread-only memory (ROM), an erasable programmable read-only memory (EPROMor Flash memory), a static random access memory (SRAM), a portablecompact disc read-only memory (CD-ROM), a digital versatile disk (DVD),a memory stick, a floppy disk, a mechanically encoded device such aspunch-cards or raised structures in a groove having instructionsrecorded thereon, and any suitable combination of the foregoing. Acomputer readable storage medium, as used herein, is not to be construedas being transitory signals per se, such as radio waves or other freelypropagating electromagnetic waves, electromagnetic waves propagatingthrough a waveguide or other transmission media (e.g., light pulsespassing through a fiber-optic cable), or electrical signals transmittedthrough a wire.

Computer readable program instructions described herein can bedownloaded to respective computing/processing devices from a computerreadable storage medium or to an external computer or external storagedevice via a network, for example, the Internet, a local area network, awide area network and/or a wireless network. The network may comprisecopper transmission cables, optical transmission fibers, wirelesstransmission, routers, firewalls, switches, gateway computers and/oredge servers. A network adapter card or network interface in eachcomputing/processing device receives computer readable programinstructions from the network and forwards the computer readable programinstructions for storage in a computer readable storage medium withinthe respective computing/processing device.

Computer readable program instructions for carrying out operations ofthe present invention may be assembler instructions,instruction-set-architecture (ISA) instructions, machine instructions,machine dependent instructions, microcode, firmware instructions,state-setting data, or either source code or object code written in anycombination of one or more programming languages, including an objectoriented programming language such as Smalltalk, C++ or the like, andconventional procedural programming languages, such as the “C”programming language or similar programming languages. The computerreadable program instructions may execute entirely on the user'scomputer, partly on the user's computer, as a stand-alone softwarepackage, partly on the user's computer and partly on a remote computeror entirely on the remote computer or server. In the latter scenario,the remote computer may be connected to the user's computer through anytype of network, including a local area network (LAN) or a wide areanetwork (WAN), or the connection may be made to an external computer(for example, through the Internet using an Internet Service Provider).In some embodiments, electronic circuitry including, for example,programmable logic circuitry, field-programmable gate arrays (FPGA), orprogrammable logic arrays (PLA) may execute the computer readableprogram instructions by utilizing state information of the computerreadable program instructions to personalize the electronic circuitry,in order to perform aspects of the present invention.

Aspects of the present invention are described herein with reference toflowchart illustrations and/or block diagrams of methods, apparatus(systems), and computer program products according to embodiments of theinvention. It will be understood that each block of the flowchartillustrations and/or block diagrams, and combinations of blocks in theflowchart illustrations and/or block diagrams, can be implemented bycomputer readable program instructions.

These computer readable program instructions may be provided to aprocessor of a general purpose computer, special purpose computer, orother programmable data processing apparatus to produce a machine, suchthat the instructions, which execute via the processor of the computeror other programmable data processing apparatus, create means forimplementing the functions/acts specified in the flowchart and/or blockdiagram block or blocks. These computer readable program instructionsmay also be stored in a computer readable storage medium that can directa computer, a programmable data processing apparatus, and/or otherdevices to function in a particular manner, such that the computerreadable storage medium having instructions stored therein comprises anarticle of manufacture including instructions which implement aspects ofthe function/act specified in the flowchart and/or block diagram blockor blocks.

The computer readable program instructions may also be loaded onto acomputer, other programmable data processing apparatus, or other deviceto cause a series of operational steps to be performed on the computer,other programmable apparatus or other device to produce a computerimplemented process, such that the instructions which execute on thecomputer, other programmable apparatus, or other device implement thefunctions/acts specified in the flowchart and/or block diagram block orblocks.

The flowchart and block diagrams in the Figures illustrate thearchitecture, functionality, and operation of possible implementationsof systems, methods, and computer program products according to variousembodiments of the present invention. In this regard, each block in theflowchart or block diagrams may represent a module, segment, or portionof instructions, which comprises one or more executable instructions forimplementing the specified logical function(s). In some alternativeimplementations, the functions noted in the block may occur out of theorder noted in the figures. For example, two blocks shown in successionmay, in fact, be executed substantially concurrently, or the blocks maysometimes be executed in the reverse order, depending upon thefunctionality involved. It will also be noted that each block of theblock diagrams and/or flowchart illustration, and combinations of blocksin the block diagrams and/or flowchart illustration, can be implementedby special purpose hardware-based systems that perform the specifiedfunctions or acts or carry out combinations of special purpose hardwareand computer instructions.

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting. As used herein, thesingular forms “a”, “an” and “the” are intended to include the pluralforms as well, unless the context clearly indicates otherwise. It willbe further understood that the terms “comprises” and/or “comprising”,when used in this specification, specify the presence of statedfeatures, integers, steps, operations, elements, and/or components, butdo not preclude the presence or addition of one or more other features,integers, steps, operations, elements, components and/or groups thereof.

The corresponding structures, materials, acts, and equivalents of allmeans or step plus function elements in the claims below, if any, areintended to include any structure, material, or act for performing thefunction in combination with other claimed elements as specificallyclaimed. The description of one or more embodiments has been presentedfor purposes of illustration and description, but is not intended to beexhaustive or limited to in the form disclosed. Many modifications andvariations will be apparent to those of ordinary skill in the art. Theembodiment was chosen and described in order to best explain variousaspects and the practical application, and to enable others of ordinaryskill in the art to understand various embodiments with variousmodifications as are suited to the particular use contemplated.

What is claimed is:
 1. A computer-implemented method comprising:obtaining an aggregation grid by a wearable device of a plurality ofwearable devices capturing respective video feeds of a scene of anenvironment from different angles, the aggregation grid providing aconsistent partitioning of views of the scene by the plurality ofwearable devices into a plurality of cells; and based on an obstructionat least partially obstructing a portion of the scene from view by thewearable device, building an aggregated view of the scene for thewearable device, the building comprising: identifying one or more cellsof the aggregation grid for which the view of the scene by the wearabledevice is obstructed by the obstruction; obtaining, by the wearabledevice, from at least one other wearable device of the plurality ofwearable devices, one or more video portions of at least one video feedof the respective video feeds, the one or more video portionscorresponding to the one or more cells for which the view by thewearable device is obstructed, and the at least one video feed beingfrom the at least one other wearable device, for which the view for theone or more cells is unobstructed; and displaying the obtained one ormore video portions on a display of the wearable device, in which theone or more video portions are provided on the display for the one ormore cells for which the view by the wearable device is beingobstructed.
 2. The method of claim 1, wherein the building furthercomprises the wearable device providing to the at least one otherwearable device an indication of the identified one or more cells, andwherein the wearable device receives the one or more video portions fromthe at least one other wearable device in response to providing theindication of the identified one or more cells.
 3. The method of claim1, further comprising: receiving, by the wearable device, from anotherwearable device of the plurality of wearable devices, an indication ofat least one cell of the aggregation grid for which the view of thescene by the another wearable device is obstructed by the obstruction;and sending, by the wearable device, to the another wearable device, atleast one video portion of a video feed being captured by the wearabledevice, the at least one video portion corresponding to the at least onecell for which the view by the another wearable device is obstructed andthe view by the wearable device is unobstructed.
 4. The method of claim1, wherein the wearable device is a first wearable device of theplurality of wearable devices, and wherein the method further comprises:based on detecting an eye focus direction of a user of the firstwearable device, determining a target, in the scene, of the user'sfocus; identifying a second wearable device, of the plurality ofwearable devices, that has a view of the target from a position closerto the target than the first wearable device; and obtaining by the firstwearable device at least a portion of a video feed obtained by thesecond wearable device from the position closer to the target, the atleast a portion including a view of the target, to provide to the user aview of the target from the position closer to the target.
 5. The methodof claim 1, wherein a video feed of the at least one video feed is froma device viewing at least a portion of the scene from a vantage point ofthe obstruction, the at least a portion of the scene corresponding to acell of the one or more cells for which the view by the wearable deviceis obstructed, and wherein at least one video portion obtained by thewearable device for the cell comprises a video portion from the videofeed from the device.
 6. The method of claim 1, wherein the obtainingand building are performed by the wearable device.
 7. The method ofclaim 6, wherein the wearable device aggregates the view of the scene ona transparent display of the wearable device, in which the one or morevideo portions are provided on the transparent display for the one ormore cells for which the view by the wearable device is beingobstructed, and no video portions are provided on the transparentdisplay for cells for which the view by the wearable device isunobstructed.
 8. The method of claim 1, further comprising continuallybuilding the aggregated view of the scene over a period of time, whereinupdated video portions from the at least one video feed are continuallyprovided to the wearable device for presentation in place of theobstructed view for the one or more cells.
 9. The method of claim 1,further comprising dynamically adjusting cell size of the aggregationgrid based on quality of the aggregated view of the scene.
 10. Awearable device comprising: a memory; and a processor in communicationwith the memory, wherein the wearable device is configured to perform amethod, the method comprising: obtaining an aggregation grid, whereinthe wearable device is one wearable device of a plurality of wearabledevices capturing respective video feeds of a scene of an environmentfrom different angles, the aggregation grid providing a consistentpartitioning of views of the scene by the plurality of wearable devicesinto a plurality of cells; and based on an obstruction at leastpartially obstructing a portion of the scene from view by the wearabledevice, building an aggregated view of the scene for the wearabledevice, the building comprising: identifying one or more cells of theaggregation grid for which the view of the scene by the wearable deviceis obstructed by the obstruction; obtaining from at least one otherwearable device of the plurality of wearable devices, one or more videoportions of at least one video feed of the respective video feeds, theone or more video portions corresponding to the one or more cells forwhich the view by the wearable device is obstructed, and the at leastone video feed being from the at least one other wearable device, forwhich the view for the one or more cells is unobstructed; and displayingthe obtained one or more video portions on a display of the wearabledevice, in which the one or more video portions are provided on thedisplay for the one or more cells for which the view by the wearabledevice is being obstructed.
 11. The wearable device of claim 10, whereinthe building further comprises the wearable device providing to the atleast one other wearable device an indication of the identified one ormore cells, and wherein the wearable device receives the one or morevideo portions from the at least one other wearable device in responseto providing the indication of the identified one or more cells.
 12. Thewearable device of claim 10, wherein the method further comprises:receiving from another wearable device of the plurality of wearabledevices an indication of at least one cell of the aggregation grid forwhich the view of the scene by the another wearable device is obstructedby the obstruction; and sending to the another wearable device at leastone video portion of a video feed being captured by the wearable device,the at least one video portion corresponding to the at least one cellfor which the view by the another wearable device is obstructed and theview by the wearable device is unobstructed.
 13. The wearable device ofclaim 10, wherein the wearable device is a first wearable device of theplurality of wearable devices, and wherein the method further comprises:based on detecting an eye focus direction of a user of the firstwearable device, determining a target, in the scene, of the user'sfocus; identifying a second wearable device, of the plurality ofwearable devices, that has a view of the target from a position closerto the target than the first wearable device; and obtaining by the firstwearable device at least a portion of a video feed obtained by thesecond wearable device from the position closer to the target, the atleast a portion including a view of the target, to provide to the user aview of the target from the position closer to the target.
 14. Thewearable device of claim 13, wherein the wearable device furtheraggregates the view of the scene on a transparent display of thewearable device, in which the one or more video portions are provided onthe transparent display for the one or more cells for which the view bythe wearable device is being obstructed, and no video portions areprovided on the transparent display for cells for which the view by thewearable device is unobstructed.
 15. The wearable device of claim 10,wherein the method further comprises continually building the aggregatedview of the scene over a period of time, wherein updated video portionsfrom the at least one video feed are continually provided to thewearable device for presentation in place of the obstructed view for theone or more cells.
 16. A computer program product comprising: a computerreadable storage medium readable by a processing circuit and storinginstructions for execution by the processing circuit for performing amethod comprising: obtaining an aggregation grid by a wearable device ofa plurality of wearable devices capturing respective video feeds of ascene of an environment from different angles, the aggregation gridproviding a consistent partitioning of views of the scene by theplurality of wearable devices into a plurality of cells; and based on anobstruction at least partially obstructing a portion of the scene fromview by the wearable device, building an aggregated view of the scenefor the wearable device, the building comprising: identifying one ormore cells of the aggregation grid for which the view of the scene bythe wearable device is obstructed by the obstruction; obtaining, by thewearable device, from at least one other wearable device of theplurality of wearable devices, one or more video portions of at leastone video feed of the respective video feeds, the one or more videoportions corresponding to the one or more cells for which the view bythe wearable device is obstructed, and the at least one video feed beingfrom the at least one other wearable device, for which the view for theone or more cells is unobstructed; and displaying the obtained one ormore video portions on a display of the wearable device, in which theone or more video portions are provided on the display for the one ormore cells for which the view by the wearable device is beingobstructed.
 17. The computer program product of claim 16, wherein thebuilding further comprises the wearable device providing to the at leastone other wearable device an indication of the identified one or morecells, and wherein the wearable device receives the one or more videoportions from the at least one other wearable device in response toproviding the indication of the identified one or more cells.
 18. Thecomputer program product of claim 16, wherein the method furthercomprises: receiving, by the wearable device, from another wearabledevice of the plurality of wearable devices, an indication of at leastone cell of the aggregation grid for which the view of the scene by theanother wearable device is obstructed by the obstruction; and sending,by the wearable device, to the another wearable device, at least onevideo portion of a video feed being captured by the wearable device, theat least one video portion corresponding to the at least one cell forwhich the view by the another wearable device is obstructed and the viewby the wearable device is unobstructed.
 19. The computer program productof claim 16, wherein the wearable device is a first wearable device ofthe plurality of wearable devices, and wherein the method furthercomprises: based on detecting an eye focus direction of a user of thefirst wearable device, determining a target, in the scene, of the user'sfocus; identifying a second wearable device, of the plurality ofwearable devices, that has a view of the target from a position closerto the target than the first wearable device; and obtaining by the firstwearable device at least a portion of a video feed obtained by thesecond wearable device from the position closer to the target, the atleast a portion including a view of the target, to provide to the user aview of the target from the position closer to the target.
 20. Thecomputer program product of claim 16, wherein the obtaining and buildingare performed by the wearable device, and wherein the wearable deviceaggregates the view of the scene on a transparent display of thewearable device, in which the one or more video portions are provided onthe transparent display for the one or more cells for which the view bythe wearable device is being obstructed, and no video portions areprovided on the transparent display for cells for which the view by thewearable device is unobstructed.